Telephone mouth and ear piece



F. WARE.

TELEPHONE MOUTH AND BAR PIECE.

No. 297,732.- Patented Apr. 29, 1884.

Ni'rnn- STATES Ariana tribe.

FRANCIS WVARE, OF BOSTON, MASSACHUSETTS.

TELEPHONE MOUTH AND fEARPiECE.

SPECIFICATION forming part of Letters Patent No. 297,732, dated April 29, 1884:.

Application filed January 14, 1884. (No model.)

volume of sound which, in the utterance of speech, reaches the diaphragm in telephonic transmitters,without'theinconveniences which arise from the use of mouth-pieces which compel the speaker. to bring his mouth in close proximity to the diaphragm, and to concentrate the sound-waves of a receiving instrument upon the ear of the listener, as will be more particularly set forth hereinafter.

My invention differs from the ordinary speaking or listening tubes which are sometimes used in connection with telephones, in that it acts like a spherical reflector, concentrating the sound-waves upon the diaphragm or the car without that absorption which results from the multiplex reflections from the walls of the tube. 1

It also has for its object to prevent the deposition of the moisture from the breath of the speaker upon the diaphragm.

My invention consists in adetachable mouth or car piece formed-of two hemispherical sections united by a conical section. which connects the base of the larger of the two hemispheres with apex of the smaller.

It further consists in a sound-opening formed ina section of the larger hemisphere of the mouth or car piece, preferably on the side thereof, whereby its position may be adjustedv by turning the said hemisphere on its support in the connectingcone.

It further consists in means for conveniently attaching or detaching the mouth or car piece to the telephone-case.

It further consists in the several details of construction, as more particularlypointed out hereinafter.

Referring to the drawings forming part of the specification, Figure 1 is a perspective showing my invention attached to an ordinary boxtransniitter. Fig. 2 is a section of the same. Fig. 3 is a rear view of the attachment.

A semi spherical shell, B, made of any suitable material, preferably metal, is provided near its base with two lugs projecting into the plane of said base, so as to be flush therewith. One

of the lugs, O, has a longitudinal slot, and the other, D, has a lateral slot. To the perforated apex of the hemisphere B is secured the smaller end of a hollow frustum of a cone, E. The larger end of said cone is provided with a rim, 0, into which fits and is frictionally held the base of a hollow hemisphere, F. By thus connecting the larger hemisphere with the cone, the same may be turned in its bearing and a sound-opening, G, cut into said hemisphere, may thereby be adjusted to any convenient position for speaking or listening.

This instrument is secured to a telephonecase, A, by means of two screws or studs, b c, fixed to the face thereof and engaging the slots in the lugs G D. By having the slot in one lug longitudinal and in the other lateral, theinstrument may be easily and quickly attached to the telephone-box by slipping the lug 0 onto the stud b, and then turning the instrument in position, so that the slot in lugD engages stud c.

It will be understood that the case A is here shown as representing any transmitter or receiver, and the means of attaching the instrument to the case maybe varied to suit the different forms of the telephones. If used as a transmi tter, the sound-waves entering the outer hemisphere, F, through the opening G will be reflected and concentrated more or less directly upon the diaphragm of the telephone, and any moisture from the breath of thespeaker will be precipitated into the lower part of the cavity formed by parts E and F. If used as a receiver, the sound-waves will be reflected a 3. 1n a mouth or can piece for telephones, section, and means for attaching the some to 10 the combination, with the flaring connectingthe telephone-case, as set forth. piece E, of the hemispherical piece F, having In testimony whereofi have signed mynmne an opening, G, the construction being such to thisspecifieation in the presence oi'twosub- 5 that the latter may be turned upon the former, scribing witnesses.

to bring the opening into any desired position. FRANCIS \VARE.

4. Ihe combination, with the case of a te1e- Vitnesses:

phone, of a month and ear piece consisting of \V. XV. SWAN,

two hemispherical sections joined by a conical \VM. S. ROGERS. 

